str1 = '111'
print(str1)
str2 = "222"
str3 = '''333
444
7777'''
# 三引号可换行

print('%s'%str1)
print('{0}---{1}---{2}'.format(0,1,2))
str4='666'
print(f'这个程序{str4}')
# i,j = 1,3
# print(f'{i}*{j}={i*j}')

sep = ','
print(sep.join(str4))

str5 ='good good study'
# print("good".center(__width=30,__fillchar='*'))
print("good".center(30,'*'))

for i in str5:
    print(i,end='')